71909 CD/P4ADGB
71900 Series Super Precision Angular Contact Ball Bearings
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71909 CD/P4ADGB Bearing Product Overview & Core Advantages
The 71909 CD/P4ADGB is a super-precision angular contact ball bearing designed for applications demanding exceptional rotational accuracy and high-speed performance. As a universal matchable (SU) bearing supplied in a light preload (Class B) duplex set, it is engineered to accommodate combined radial and axial loads simultaneously. Its P4A tolerance class and optimized internal geometry ensure superior running accuracy, making it ideal for high-reliability, high-rigidity spindles and precision machinery.
71909 CD/P4ADGB Bearing Model Code Explained, Specifications & Naming Convention
| Code Segment | Technical Meaning |
|---|---|
| 71909 | Basic bearing series and size designation (45mm bore, 68mm OD). |
| C | Specific internal design with a 15° contact angle. |
| D | Indicates the bearing is part of a universal matchable (SU) duplex pair. |
| P4A | Denotes a super-precision tolerance class, exceeding ABEC 7/ISO P4 standards. |
| DGB | Signifies a light preload (Class B) applied to the matched set. |
71909 CD/P4ADGB Bearing Structural Features & Performance Benefits
- High Rigidity & Load Capacity: The duplex pair arrangement (SU) creates a highly rigid bearing system capable of supporting significant combined radial and axial loads. The 15° contact angle is optimized for high axial load capacity while maintaining good radial performance.
- Super-Precision & High-Speed Performance: Manufactured to P4A tolerance class, this bearing ensures minimal runout and vibration. The phenolic resin cage and open design contribute to low friction and heat generation, enabling a high limiting speed of 41,000 rpm.
- Universal Matchability: The Universal Matchable (SU) designation means any two bearings from this series can be paired in any combination (face-to-face, back-to-back) without performance degradation, simplifying inventory and assembly.
- Optimized Material Selection: Constructed from high-grade chrome steel for rings and balls, ensuring high durability and fatigue life. The phenolic cage offers excellent strength-to-weight ratio and smooth operation at high speeds.
71909 CD/P4ADGB Bearing Typical Application Areas
The 71909 CD/P4ADGB is ideally suited for high-performance applications where precision, speed, and rigidity are paramount. Key industries and equipment include:
- Machine Tool Spindles: High-speed milling, grinding, and turning centers.
- Precision Spindles: PCB drilling, engraving, and high-frequency motor spindles.
- Robotics: High-accuracy rotary joints and arm actuators.
- Aerospace & Defense: Gyroscopes, radar systems, and navigation instruments.
- Medical Equipment: Dental handpieces and laboratory centrifuges.
